Graptolites Fossil Palaeontology
Автор: Geology lexicon
Загружено: 2022-08-09
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Описание:
Graptolites are fossils belongs to; #Subphylum- Hemichordata
#Lower Palaeozoic rocks(Ordovician & Silurian period).
#Black shales
Their colonies are basically preserve as fossil, which are made up of chitin and they are hollow tube like structure.
The first form part of the colony is #Sicula,
Sicula consists of Nema,Aperture,Virgella, Prosicula and Metasicula.
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